GILJEN, Zdravko ;NEDELJKOVIC, Milos ;CHENG, Yongguang . INFLUENCE OF PUMP-TURBINE SPECIFIC SPEED ON HYDRAULIC TRANSIENT PROCESSES. Articles in Press, [S.l.], v. 0, n.0, p. , january 2024. ISSN 0039-2480. Available at: <https://www.sv-jme.eu/article/influence-of-pump-turbine-specific-speed-on-hydraulic-transient-processes/>. Date accessed: 08 may. 2024. doi:http://dx.doi.org/.
Giljen, Z., Nedeljkovic, M., & Cheng, Y. (0). INFLUENCE OF PUMP-TURBINE SPECIFIC SPEED ON HYDRAULIC TRANSIENT PROCESSES. Articles in Press, 0(0), . doi:http://dx.doi.org/
@article{.,
author = {Zdravko Giljen and Milos Nedeljkovic and Yongguang Cheng},
title = {INFLUENCE OF PUMP-TURBINE SPECIFIC SPEED ON HYDRAULIC TRANSIENT PROCESSES},
journal = {Articles in Press},
volume = {0},
number = {0},
year = {0},
keywords = {hydraulic transients, pump-turbine, influence of the specific speed, load rejection, working point trajectory, method of characteristics; },
abstract = {The main motive of this paper is to perform the transient process analysis on the influence of different specific speeds (nq) of the three model pump-turbines possibly implemented at the hydropower pump storage plant Bajina Basta. The intention is to analyze the operation regimes along the S-shaped characteristic curve, which makes difficulties in calculations during the load-rejection process. Problems are manifested by an unusual increase in water pressure, followed by an increase in machine vibrations, thus threatening the stability of machine operation. The subject of research are the four-quadrant (4Q) characteristic curves, presented in the form of Suter curves (head and momentum parameters - Wh, Wm, in dependence of angle θ) for different wicket gate openings, of the three pump-turbine models with different specific speeds (nq = 27, 38 and 50) published for the first time in literature. These 4Q characteristics are used as input data for numerical code developed to calculate the simultaneous load rejection of both pump-turbines. The numerical code is based on the method of characteristics and applied for the test case at HPSP Bajina Basta, especially dealing with the area of characteristic S-shaped curves which may lead to serious instability in operation during the transient process. The calculation results show changes in the pressure, speed of rotation and discharge of the machine operation regimes, but the important findings are reflected in further application of the results to determine the parametric flow and speed (Q11 - n11) trajectories of the operating points, where unstable behavior of a pump-turbine operating in turbine mode is presented and periodically the trajectories also pass through the reverse pump zone.},
issn = {0039-2480}, pages = {}, doi = {},
url = {https://www.sv-jme.eu/article/influence-of-pump-turbine-specific-speed-on-hydraulic-transient-processes/}
}
Giljen, Z.,Nedeljkovic, M.,Cheng, Y. 0 January 0. INFLUENCE OF PUMP-TURBINE SPECIFIC SPEED ON HYDRAULIC TRANSIENT PROCESSES. Articles in Press. [Online] 0:0
%A Giljen, Zdravko %A Nedeljkovic, Milos %A Cheng, Yongguang %D 0 %T INFLUENCE OF PUMP-TURBINE SPECIFIC SPEED ON HYDRAULIC TRANSIENT PROCESSES %B 0 %9 hydraulic transients, pump-turbine, influence of the specific speed, load rejection, working point trajectory, method of characteristics; %! INFLUENCE OF PUMP-TURBINE SPECIFIC SPEED ON HYDRAULIC TRANSIENT PROCESSES %K hydraulic transients, pump-turbine, influence of the specific speed, load rejection, working point trajectory, method of characteristics; %X The main motive of this paper is to perform the transient process analysis on the influence of different specific speeds (nq) of the three model pump-turbines possibly implemented at the hydropower pump storage plant Bajina Basta. The intention is to analyze the operation regimes along the S-shaped characteristic curve, which makes difficulties in calculations during the load-rejection process. Problems are manifested by an unusual increase in water pressure, followed by an increase in machine vibrations, thus threatening the stability of machine operation. The subject of research are the four-quadrant (4Q) characteristic curves, presented in the form of Suter curves (head and momentum parameters - Wh, Wm, in dependence of angle θ) for different wicket gate openings, of the three pump-turbine models with different specific speeds (nq = 27, 38 and 50) published for the first time in literature. These 4Q characteristics are used as input data for numerical code developed to calculate the simultaneous load rejection of both pump-turbines. The numerical code is based on the method of characteristics and applied for the test case at HPSP Bajina Basta, especially dealing with the area of characteristic S-shaped curves which may lead to serious instability in operation during the transient process. The calculation results show changes in the pressure, speed of rotation and discharge of the machine operation regimes, but the important findings are reflected in further application of the results to determine the parametric flow and speed (Q11 - n11) trajectories of the operating points, where unstable behavior of a pump-turbine operating in turbine mode is presented and periodically the trajectories also pass through the reverse pump zone. %U https://www.sv-jme.eu/article/influence-of-pump-turbine-specific-speed-on-hydraulic-transient-processes/ %0 Journal Article %R %& %P 1 %J Articles in Press %V 0 %N 0 %@ 0039-2480 %8 2024-01-24 %7 2024-01-24
Giljen, Zdravko, Milos Nedeljkovic, & Yongguang Cheng. "INFLUENCE OF PUMP-TURBINE SPECIFIC SPEED ON HYDRAULIC TRANSIENT PROCESSES." Articles in Press [Online], 0.0 (0): . Web. 08 May. 2024
TY - JOUR AU - Giljen, Zdravko AU - Nedeljkovic, Milos AU - Cheng, Yongguang PY - 0 TI - INFLUENCE OF PUMP-TURBINE SPECIFIC SPEED ON HYDRAULIC TRANSIENT PROCESSES JF - Articles in Press DO - KW - hydraulic transients, pump-turbine, influence of the specific speed, load rejection, working point trajectory, method of characteristics; N2 - The main motive of this paper is to perform the transient process analysis on the influence of different specific speeds (nq) of the three model pump-turbines possibly implemented at the hydropower pump storage plant Bajina Basta. The intention is to analyze the operation regimes along the S-shaped characteristic curve, which makes difficulties in calculations during the load-rejection process. Problems are manifested by an unusual increase in water pressure, followed by an increase in machine vibrations, thus threatening the stability of machine operation. The subject of research are the four-quadrant (4Q) characteristic curves, presented in the form of Suter curves (head and momentum parameters - Wh, Wm, in dependence of angle θ) for different wicket gate openings, of the three pump-turbine models with different specific speeds (nq = 27, 38 and 50) published for the first time in literature. These 4Q characteristics are used as input data for numerical code developed to calculate the simultaneous load rejection of both pump-turbines. The numerical code is based on the method of characteristics and applied for the test case at HPSP Bajina Basta, especially dealing with the area of characteristic S-shaped curves which may lead to serious instability in operation during the transient process. The calculation results show changes in the pressure, speed of rotation and discharge of the machine operation regimes, but the important findings are reflected in further application of the results to determine the parametric flow and speed (Q11 - n11) trajectories of the operating points, where unstable behavior of a pump-turbine operating in turbine mode is presented and periodically the trajectories also pass through the reverse pump zone. UR - https://www.sv-jme.eu/article/influence-of-pump-turbine-specific-speed-on-hydraulic-transient-processes/
@article{{}{.},
author = {Giljen, Z., Nedeljkovic, M., Cheng, Y.},
title = {INFLUENCE OF PUMP-TURBINE SPECIFIC SPEED ON HYDRAULIC TRANSIENT PROCESSES},
journal = {Articles in Press},
volume = {0},
number = {0},
year = {0},
doi = {},
url = {https://www.sv-jme.eu/article/influence-of-pump-turbine-specific-speed-on-hydraulic-transient-processes/}
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TY - JOUR AU - Giljen, Zdravko AU - Nedeljkovic, Milos AU - Cheng, Yongguang PY - 2024/01/24 TI - INFLUENCE OF PUMP-TURBINE SPECIFIC SPEED ON HYDRAULIC TRANSIENT PROCESSES JF - Articles in Press; Vol 0, No 0 (0): Articles in Press DO - KW - hydraulic transients, pump-turbine, influence of the specific speed, load rejection, working point trajectory, method of characteristics, N2 - The main motive of this paper is to perform the transient process analysis on the influence of different specific speeds (nq) of the three model pump-turbines possibly implemented at the hydropower pump storage plant Bajina Basta. The intention is to analyze the operation regimes along the S-shaped characteristic curve, which makes difficulties in calculations during the load-rejection process. Problems are manifested by an unusual increase in water pressure, followed by an increase in machine vibrations, thus threatening the stability of machine operation. The subject of research are the four-quadrant (4Q) characteristic curves, presented in the form of Suter curves (head and momentum parameters - Wh, Wm, in dependence of angle θ) for different wicket gate openings, of the three pump-turbine models with different specific speeds (nq = 27, 38 and 50) published for the first time in literature. These 4Q characteristics are used as input data for numerical code developed to calculate the simultaneous load rejection of both pump-turbines. The numerical code is based on the method of characteristics and applied for the test case at HPSP Bajina Basta, especially dealing with the area of characteristic S-shaped curves which may lead to serious instability in operation during the transient process. The calculation results show changes in the pressure, speed of rotation and discharge of the machine operation regimes, but the important findings are reflected in further application of the results to determine the parametric flow and speed (Q11 - n11) trajectories of the operating points, where unstable behavior of a pump-turbine operating in turbine mode is presented and periodically the trajectories also pass through the reverse pump zone. UR - https://www.sv-jme.eu/article/influence-of-pump-turbine-specific-speed-on-hydraulic-transient-processes/
Giljen, Zdravko, Nedeljkovic, Milos, AND Cheng, Yongguang. "INFLUENCE OF PUMP-TURBINE SPECIFIC SPEED ON HYDRAULIC TRANSIENT PROCESSES" Articles in Press [Online], Volume 0 Number 0 (24 January 2024)
Articles in Press
The main motive of this paper is to perform the transient process analysis on the influence of different specific speeds (nq) of the three model pump-turbines possibly implemented at the hydropower pump storage plant Bajina Basta. The intention is to analyze the operation regimes along the S-shaped characteristic curve, which makes difficulties in calculations during the load-rejection process. Problems are manifested by an unusual increase in water pressure, followed by an increase in machine vibrations, thus threatening the stability of machine operation. The subject of research are the four-quadrant (4Q) characteristic curves, presented in the form of Suter curves (head and momentum parameters - Wh, Wm, in dependence of angle θ) for different wicket gate openings, of the three pump-turbine models with different specific speeds (nq = 27, 38 and 50) published for the first time in literature. These 4Q characteristics are used as input data for numerical code developed to calculate the simultaneous load rejection of both pump-turbines. The numerical code is based on the method of characteristics and applied for the test case at HPSP Bajina Basta, especially dealing with the area of characteristic S-shaped curves which may lead to serious instability in operation during the transient process. The calculation results show changes in the pressure, speed of rotation and discharge of the machine operation regimes, but the important findings are reflected in further application of the results to determine the parametric flow and speed (Q11 - n11) trajectories of the operating points, where unstable behavior of a pump-turbine operating in turbine mode is presented and periodically the trajectories also pass through the reverse pump zone.